July Weather in Cook Islands Cook Islands

Daily high temperatures are around 77°F, rarely falling below 73°F or exceeding 81°F.

Daily low temperatures are around 69°F, rarely falling below 64°F or exceeding 74°F.

For reference, on February 19, the hottest day of the year, temperatures in Cook Islands typically range from 77°F to 84°F, while on August 9, the coldest day of the year, they range from 69°F to 77°F.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on July. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

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The month of July in Cook Islands experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 45% to 40%.

The clearest day of the month is July 31, with clear, mostly clear, or partly cloudy conditions 60% of the time.

For reference, on January 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 76%, while on August 4, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 60%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Cook Islands, the chance of a wet day over the course of July is gradually decreasing, starting the month at 19% and ending it at 17%.

For reference, the year's highest daily chance of a wet day is 47% on February 13, and its lowest chance is 16% on June 15.

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during July in Cook Islands is essentially constant, remaining about 2.4 inches throughout, and rarely exceeding 5.2 inches or falling below 0.4 inches.

Over the course of July in Cook Islands, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 18 minutes, implying an average daily increase of 35 seconds, and weekly increase of 4 minutes, 8 seconds.

The shortest day of the month is July 1, with 10 hours, 52 minutes of daylight and the longest day is July 31, with 11 hours, 10 minutes of daylight.

The latest sunrise of the month in Cook Islands is 7:17 AM on July 5 and the earliest sunrise is 7 minutes earlier at 7:10 AM on July 31.

The earliest sunset is 6:09 PM on July 1 and the latest sunset is 11 minutes later at 6:20 PM on July 31.

Daylight saving time is not observed in Cook Islands during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 5:54 AM and sets 13 hours, 26 minutes later, at 7:20 PM, while on June 20, the shortest day of the year, it rises at 7:15 AM and sets 10 hours, 50 minutes later, at 6:06 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for July 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in Cook Islands is gradually decreasing during July, falling from 51% to 48% over the course of the month.

For reference, on February 2, the muggiest day of the year, there are muggy conditions 99% of the time, while on August 7, the least muggy day of the year, there are muggy conditions 46% of the time.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Cook Islands is essentially constant during July, remaining within 0.4 miles per hour of 14.1 miles per hour throughout.

For reference, on July 28, the windiest day of the year, the daily average wind speed is 14.5 miles per hour, while on March 13, the calmest day of the year, the daily average wind speed is 12.7 miles per hour.

The highest daily average wind speed during July is 14.5 miles per hour on July 28.

The hourly average wind direction in Cook Islands throughout July is predominantly from the east, with a peak proportion of 50% on July 29.

Cook Islands is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature in Cook Islands is essentially constant during July, remaining around 76°F throughout.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Temperatures in Cook Islands are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Cook Islands are rapidly increasing during July, increasing by 671°F, from 1°F to 672°F, over the course of the month.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in Cook Islands is essentially constant during July, remaining within 0.2 kWh of 3.9 kWh throughout.

For the purposes of this report, the geographical coordinates of Cook Islands are -21.248 deg latitude, -159.785 deg longitude, and 0 ft elevation.

The topography within 2 miles of Cook Islands is essentially flat, with a maximum elevation change of 0 feet and an average elevation above sea level of 0 feet. Within 10 miles is also essentially flat (0 feet). Within 50 miles is also essentially flat (0 feet).

The area within 2 miles of Cook Islands is covered by water (100%), within 10 miles by water (100%), and within 50 miles by water (100%).